DF2398TE20 Renesas Electronics America, DF2398TE20 Datasheet - Page 472

• Manufacturer Part Number: DF2398TE20
• Description: IC H8S MCU FLASH 256K 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2398TE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 120-TQFP, 120-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2398TE20; HD64F2398TE20

12.3
12.3.1
TCNT is incremented by input clock pulses (either internal or external).
Internal Clock: Three different internal clock signals (ø/8, ø/64, or ø/8192) divided from the system clock (ø) can be
selected, by setting bits CKS2 to CKS0 in TCR. Figure 12-2 shows the count timing.
External Clock: Three incrementation methods can be selected by setting bits CKS2 to CKS0 in TCR: at the rising edge,
the falling edge, and both rising and falling edges.
Note that the external clock pulse width must be at least 1.5 states for incrementation at a single edge, and at least 2.5
states for incrementation at both edges. The counter will not increment correctly if the pulse width is less than these
values.
Figure 12-3 shows the timing of incrementation at both edges of an external clock signal.
Rev.6.00 Oct.28.2004 page 442 of 1016
REJ09B0138-0600H
Operation
TCNT Incrementation Timing
ø
Internal clock
Clock input
to TCNT
TCNT
ø
External clock
input
Clock input
to TCNT
TCNT
Figure 12-3 Count Timing for External Clock Input
Figure 12-2 Count Timing for Internal Clock Input
N–1
N–1
N
N
N+1
N+1